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Past exam of the mathematics course of the University of Cambridge
/
2019
/
ia
/
Paper 2
/
9F
/
b
/
ii
/
Solution
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2019
ia
Paper 2
9F
b
ii
Created
2026-09-24
Updated
2026-09-29
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The two possible ways to observe one ball of each colour have
probabilities
P
(
W
I
,
B
II
)
=
5
3
4
3
=
20
9
,
P
(
B
I
,
W
II
)
=
5
2
4
1
=
20
2
.
(1)
Conditioning on their union therefore gives
P
(
W
I
,
B
II
∣
one white and one black
)
=
11
9
.
(2)
Ancestors
(12)
ii
b
9F
Paper 2
ia
2019
Past exam of the mathematics course of the University of Cambridge
Mathematics course of the University of Cambridge
Course of the University of Cambridge
University of Cambridge
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